Handmade in england by g.ryder & co. From the finest quality archival papers & boards. These boxes are made to the highest standard in materials & construction & are the first choice for leading galleries & museums worldwide. The portfolio box is widely accepted as the best method for storing prints from 8x10 through to 20x24. Acid & lignin free & complying with photo activity test (pat) iso 18916, these boxes are designed to protect your photographs, art & documents for a lifetime.